Earlier Friday, authorities said suspicious packages addressed to New Jersey Sen. Cory Booker and former National Intelligence Director James Clapper — both similar to those containing pipe bombs sent to other prominent critics of President Donald Trump— had been intercepted.

The discoveries — making 12 so far — further spurred a coast-to-coast investigation, as officials scrambled to locate a culprit and possible motive amid questions about whether new packages were being sent or simply surfacing after a period in mail system.

The devices have targeted well-known Democrats including former President Barack Obama, former Vice President Joe Biden, Hillary Clinton and former Attorney General Eric Holder.

Former Vice President Joe Biden spoke on Thursday night about the pipe bombs that were mailed to prominent Democrats including himself. Biden said he hopes politicians will focus on unifying the country and reducing heated rhetoric.

The FBI said the package to Booker was intercepted in Florida. The one discovered at a Manhattan postal facility was addressed to Clapper at CNN’s address. An earlier package had been sent to former Obama CIA Director John Brennan via CNN in New York.

Attorney General Jeff Sessions said Friday the Justice Department was dedicating every available resource to the investigation “and I can tell you this: We will find the person or persons responsible. We will bring them to justice.”

Trump, on the other hand, complained that “this ‘bomb’ stuff” was taking attention away from the upcoming election and said critics were wrongly blaming him and his heated rhetoric.